We report on the observation of Zener tunneling of light waves in spectral and time-resolved transmission measurements, performed on an optical superlattice made of porous silicon. The structure was designed to have two photonic minibands, spaced by a narrow frequency gap. A gradient in the refractive index was introduced to create two optical Wannier-Stark ladders and, at a critical value of the optical gradient, tunneling between energy bands was observed in the form of an enhanced transmission peak and a characteristic time dependence of the transmission. © 2005 The American Physical Society.
|Titolo:||Zener tunneling of light waves in an optical superlattice|
|Autori interni:||OTON NIETO, CLAUDIO JOSE|
|Data di pubblicazione:||2005|
|Rivista:||PHYSICAL REVIEW LETTERS|
|Appare nelle tipologie:||1.1 Articolo su Rivista/Article|